Image distortion using the vpp conversion

Hello,

I am currently working on a project using the Intel Media SDK; when I worked on the conversion from RGB to NV12, the encoding works really good and fast, but there is a huge distortion in the resulted image, I am not sure whether this is due to the vpp conversion or to the encoding, but I assume it's due to the vpp conversion; although I compared my code against the code samples in the Media SDK, I haven't found any difference.

Please take a look at the video I uploaded to have an idea about the problem.